摘要海岸线是海洋与陆地的分界线，它的更确切的定义是海水向陆到达的极限位置的连线。由于受到潮汐作用以及风暴潮等影响，海水有涨有落，海面时高时低，这条海洋与陆地的分界线时刻处于变化之中。改革开放以来，我国经济飞速发展，特别是沿海地带由于其天然的交通和资源优势，引来大量人口在此定居生活，各种人为的开发使得本就不稳定的海岸线变得更加脆弱。能够精确、实时、全面的提取海岸线对我国的可持续发展具有重大的战略意义，对海岸带区域资源的管理与利用也具有举足轻重的作用。75803

历史上，对海岸线的监测由来已久，传统的观测方式不仅效率低、费时长、消耗高而且严重有环境因素制约，得到的有效信息很少。近代以来，科学技术的日益进步，利用太空遥感影像提取海岸线成为主流手段，相比传统的观测方式，遥感监测具有诸多优势，比如说连续性好、观测范围大、省时省力、准确度高等。可用于海岸线提取的卫星影像资料日益丰富，其中Landsat系列卫星因为其覆盖面广、空间分辨率高、连续性好等优势成为海岸线提取中使用最多的数据之一。由于海岸线提取的重大经济效益与社会效益，越来越多的研究人员参与进来，提出创造了多种提取方法，这些方法各有优劣，适用类型也不尽相同。

本文就其中几种常用的方法以长江河口淤泥质海岸为研究对象，分别研究适合于各自情况的水边线提取方法，尝试寻找适用于所有情况或多数情况的水边线提取算法。

毕业论文关键字：landsat影像  水边线  遥感  长江  环境监测

Landsat image edge extraction method research

Abstract The coastline is the piding line between the sea and the land, and its more precise definition is the connection of the sea water to the limit of the land to the land。 Due to the effects of tidal and storm surge, the sea water has up and down, the sea is high and low, the sea and land boundary time is changing。 Since the reform and opening up, the rapid development of economy of our country, especially the coastal zone due to its natural transportation and resource advantages, attracted a large number of people to settle down in this life, all sorts of human development makes the instability of the coastline has become more vulnerable。 It is of great strategic significance for the sustainable development of our country to accurately, timely and comprehensively extracting the coastline, and it also has a decisive role in the management and utilization of the coastal zone resources。

Historically, the monitoring of coastline has a long history, the traditional observation methods are not only inefficient, Fei Shichang, high consumption and serious environmental factors, the effective information is very little。 Since modern times, the increasing progress of science and technology, use of space remote sensing images from the coastline has become a mainstream means。 Compared to the traditional way of observation, remote sensing monitoring has many advantages, for example can good continuity, large observation range, time saving, labor saving, accuracy higher。 Can be used for Coastline Extraction of satellite image data has become increasingly rich and colorful。 The Landsat series because of its wide coverage, high spatial resolution, good continuity and become one of the Coastline Extraction data。 Because of the significant economic benefit and social benefit, more and more researchers are involved in the extraction of the coastline。 It is proposed to create a variety of extraction methods。 These methods have their own advantages and disadvantages, and the applicable types are not the same。

The several important methods in the Changjiang Estuary mud coast as the research object, respectively, to study suitable to its waterside line extraction method, tried to find the applicable to all or most of the waterside line extraction algorithm。